Focusing attachment for cameras.



F. L. SCHANTZ. FOCUSING ATTACHMENT FOR lCAMERAS.

APPLICATION FIL-ED MAR. I7. 1916.

Puten@ om. 17, 1916.

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FRANK L. scHANTa-or ROCHESTER, NEW YORKf.. l

To allwhomz'ezmag/ concern: `I .Y Be it known that I, FRAN 1i L. SCHANTZ, afi' citizen of the United States, residing aty Rochester, in4 the county of vMonroeand '5 State of New York, have invented certain Attachments for Cameras, of whiclithe fol lowing is a specification.

The object of this inventionvis topro'vide'f a camera. with a. new and improved form of.;

focusing attachment .with which the camera" can bevery accurately focused and adj ustedf' f Another object of this invention is toproll vide a camera with an attachment through which the object ofwhichapicture isto be takenrcan be watched Whilel the exposure is being made. l

Anotherobject of this invention i-s to provide a camera with ,a focusing attachment Which shows the object of which apicture is to be ymade in exactly the same size and 'posi-l tion as it Will be projected on the sensitized film of a camerawhen anexposure is being made. i` i fil' A 2a u Anotherobject of this invention is to provide a focusing-device Whichcan be readily attachedrand detached from the side of any y foldingjcamera.' y

.-"lhese-l and other .objects of my ,invention y y will be fully illustrated in the drawings,- defscribed in the specification andfpointed out in the claims at the end thereof. j s

V'In the accompanying drawings, Figure 1 is a front elevation of the camera ,with the focusing device attached thereto'.- Fig. Q is a top plan .view of the camera and focusing device. Fig. Bis a section taken onv the line X--3X of Fig. 1. f i

In'the drawings like reference numerals 40 indicate like. parts. 1 v

The camera shown in the drawings', may be one of any of the well known typesv on the market which consist chiefly'of a body 1 havinga bed plate 2 ,hinged at the front thereof. 'To this bed plate is fasteneda .quidefor runway 3 on which is mounted to' 1`slide the frame 4E which carries the casing yfor the lensyshuttery and diaphragm. l Suspentled`-between theJframe4 and the body 1 5.50 ofthe amera are the bellows 5', in fb'ac'k of ,tfvh'ihfis4 lplaced the Vsensitized film or plate. A" scale is provided on the bed plate 2 over which the pointer 7, which is fastened to the frame 4, is'lmoved to indicate approximately the distance to which roce-sinc- ATTACHMENT non CAMERASh specification of Letters Patent.' v ,Patentelcti'17;1'916. Applicationmarinai-c1117, 191s. semaine. 84,9613..." i i' l i the. lens ofr the camera is focused.

So far I have described the main features vof any of the well'known types of cameras to v show that the focusing device which` I am new and useful Improvements lnFocus'ing'4 j Thej focusing device is z ldapted,to-bev clamped to lthe side of the camera. 'bodyl by `means of a thumb screwl S which passes through the slot y9 provided in the side of the A ocusing device and into the threadednpen-v l. Vmg provided 1n .the camera for the usey 4of a '-trip'od, as shownin Fig. The focusing camera'consists of a body l1O,.to vthe front of turnis fastened the kguide orru1iway. .`12 onV` diaphragm7 the shutter being omittedtherefrom. The' bellows 1l are suspended :be-

tween the frame 13 landthe body 10 in the ordinary manner.,` The backof the focusing camera is provided with a focusing glass or l 'screen l5 onto which the` l s picture -lwhich is to be focused y1s projected.

As will be seen from an inspection ofFigs. -1 and .2, the focusing camera. is practically duplicatevof the cameraproper' except that the. body .of the focusing camera is` not constructedA tio receive a sensitized'film or plate glass or screen 4is inserted." Theffguide 3,

frame 4 and bellows A5 are identicalfin size to the guidel,I framel `andbellowsillandev'en the scale 1G provided on-the bedplate 11 corresponds to the -fscale (5 mounted on the f.

',The casing on'theframelis also provided 'with a diaphragm identical' ltotheone used in the camera. Thereis no need for a shutter in the focuslng camera and itistherefore omitted fthere'from.

An adjusting arm 17 is.lviivotallySinountedVL to the frame 13'of the focusingcamera which is usedufor a purpose thatwill presently appena In operation the fraine 13 ,and bellows 14 of they focusing camera fare pulledout to the in` place of which,-however' the focusing is to'be made on the screen 15 in such a Inanlner that every line thereof is perfectly clear and sharp. The operator then notes the po'- sition of the lens `:front of the focusing camera either by its general position of the lens front of the focusing camera or by the pointerv 18 von the scale 16 and lines up the lens front of the camera accordingly. To facilitate the lining up of the camera .parts to correspond to those of the focusing camera,

the 'arm 17 may be swung out into the path of' the frame 4 of the camera so that when -the lens front of the camera is pulled out until -it strikes the arms 17, as shown in Figs. 1 and 2, the camera is lined up to correspond with 'the' focusing `camera and the image on'the screen 15 shows exactly a duplicate of the. one which is about to be projected onto the sensitized. film or plate of the camera as soon als an exposure ismade. The device also j permits the operator to Watch through the focusing camera the object of `which he intends to make a picture before,

during and aftertlie exposure With lthe saine accuracy as if he Were looking through the camera itself.

It Will be understood that the body of the l focusing camera can be made thinner than lfio the body of the camera to which it isattached, so that it can be easily carried 1n a pocket when it .is detached' from the camera. l

As shown in Figs. 1 and 2 the arm 17 is hinged near the. middle thereof so that it can be foldedfivhen not in use.

As nearly all thelens fronts of the cameras have a sliding front which permits an adjustment thereof sideivise, the lens front of the focusingfcamera may also be made to move sideivise to give it the same 'range of adjustment asthe lens front of the camera.

1. The combination of a camera having a focusing device attached thereto, said focusing device consisting of a lens front,a lens a `clamping sci-euv in the side of said foolising device to clamp said body-to a camera to line up the focal planes'. a folding arm pivoted on said lens front. said folding arm being adapted to swing into the path of the lens frontof thefcamcra to which said focusing device is attached.

3. 'l`heconibination in a focusing camera,

of body, a bed plate'hinged thereto, a lens l front mounted to slide on said bed plate, 'i

a. lens carried .by said lensfront, an arm attached to said lens-front to project into the path of the lens front-of the camera to .be focused and lined up therewith, la focus-- ing screen mounted on the back of saidbody and means to clamp said body to a camera and line 1t up with the focal plane thereof.

4. The combination in a folding focusing camera Aof a frame or body, a bed plate hinged to said body, a lens front mounted to slide on` said bed plate, a lens carried by said lens front, a bellows interposed between said lens front and said body, a focusing screen at the back of'said body, an elongatedopening inthe sideofsaid body,.an adjust- 4 ing screw passing through said elongated opening, said adjusting screw being adapted to clam) said focusing camera to the body of al1-"11n camerajand hold said focusing cameral in'proper ahnement 'with Athe ihn camera, a gage on said focusing device, ysaid gageforming a stop against which the lens frontv of the film camera is moved andadjusted, with relation to said focusing camera.

5. A double camera comprising a photographing camera on one side and an observing camera on the other side, said lcameras v having duplicate lenses, each of said cameras having an adjustable lens front, the lens front of the observing camerabeing adjustable to focus independently of the lens front;

,of the photographic camera, a gage on the lens front of the observing camera projecting into the path of the lens front of the othercamera to indicate the corresponding focal position of the other lens front'.

G. A double camera comprising a photographing camera onone'side and an observ- 105 ing camera on the'other side, said cameras having duplicate lenses, each Aof said cameras having -an adjustable lens front, the lens front of the observing camera being adjustof the photographing camera, the lens front ofl thebbserving camera indicating by its position the correct position of the lens front of the photographic camera for photographing the object in vien". l

T. A double camera comprising a photographing camera and an observing camera, each having a separate box placed sideby side with the adjacent sides clamped to-A able to focus independently of the lens fron-t gethcr. said ycameras having duplicate lenses, l'O

each .of said cameras having an adjustable lens front. the lens front of the observing camera being adjustable to focus independently of the lens front of the photographing camera. i

S. A film camera comprising a photographing camera and an observing camera, said photographing camera being adapted to receive a roll lilni,'s:\id film being adapted to passover the focal plane of said photograph- Lemme H3 ing camera, said observing camera having a translucent focusing screen in its focal plane, said cameras having duplicate lenses, each if said Cameras having -an adjustable lens front, the lens front of the observing camera being n'cljusnble to focus' independently of the lens front ofthe photographing eminem,

'tion for the lens frQnt'of said photographing v104 camera. l

In testlmony whereof I ax my slgnature.

FRANK L. SCHANTZ. 

